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Finding the Fourth Proportional to 390,340.54, 585,511.01 and 109,857.79

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Solution

The fourth proportional to 390,340.54, 585,511.01 and 109,857.79 is: 164,786.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,340.54 : 585,511.01 = 109,857.79 : x
  2. Step 2: Convert to fraction form
    390,340.54/585,511.01 = 109,857.79/x
  3. Step 3: Cross multiply
    390,340.54x = 585,511.01 × 109,857.79
  4. Step 4: Simplify right side
    390,340.54x = 64,322,942,102.42
  5. Step 5: Solve for x
    x = 64,322,942,102.42/390,340.54
  6. Step 6: Final answer
    x = 164,786.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.